Gtk 错误：读取 PNG 图像文件时发生致命错误

Question

当我运行程序并想要向其加载图像时，会出现选择图像的窗口，但在程序崩溃后不久，我收到错误：## Heading ##

Gtk:ERROR:../../../../gtk/gtkiconhelper.c:494:ensure_surface_for_gicon: assertion failed (error == NULL): Failed to load /usr/share/icons/Yaru/16x16/status/image-missing.png: Fatal error reading PNG image file: Invalid IHDR data (gdk-pixbuf-error-quark, 0)  
Bail out! Gtk:ERROR:../../../../gtk/gtkiconhelper.c:494:ensure_surface_for_gicon: assertion failed (error == NULL): Failed to load /usr/share/icons/Yaru/16x16/status/image-missing.png: Fatal error reading PNG image file: Invalid IHDR data (gdk-pixbuf-error-quark, 0)  
Aborted

我尝试将

unset GDK_PIXBUF_MODULEDIR

和

unset GDK_PIXBUF_MODULE_FILE

添加到

.bashrc

，当错误再次出现时，该程序运行了大约 7 次。然后我尝试运行

sudo update-mime-database /usr/share/mime

但没有任何改变。有人提到以

sudo

模式运行解决了问题，但对我没有任何帮助。最糟糕的是有时程序运行得很好。我连续启动几次，但错误似乎没有显现出来。
编辑： 我有一个用 Qt 制作的简单 gui，它有一个按钮和一个 QGraphicsView，下面是可能有用的代码片段。 主窗口：

#include "mainwindow.h"
#include "./ui_mainwindow.h"

#include <iostream>
#include <QFileDialog>
#include <QMessageBox>
#include <QWidget>
#include <QTableWidget>
#include <QString>
#include <QCloseEvent>

#include "colorfilter.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    this->setFixedSize(800, 600);
    ui->wHidden->hide();

    connect(ui->pbUploadImage, &QPushButton::clicked, this, &MainWindow::uploadImage);
    connect(ui->pbShowLayer, &QPushButton::clicked, this, &MainWindow::exposeLayer);

}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::uploadImage()
{
    if(ui->imgView->scene())
        ui->imgView->scene()->clear();

    this->m_fName = QFileDialog::getOpenFileName(this, tr("Open Image"), "/home", tr("Image Files (*.png *.jpg *.bmp)"));
    if(this->m_fName.isEmpty())
        return;

    QPixmap pMap(this->m_fName);

    if (! ui->imgView->scene()) {
        qDebug() << "No Scene!";

        QGraphicsScene *scene = new QGraphicsScene(this);
        ui->imgView->setScene(scene);
    }

    ui->imgView->scene()->addPixmap(pMap);
    std::cout << m_fName .toStdString()<< std::endl;

}

void MainWindow::exposeLayer()
{
    if(this->m_fName.size() == 0){
        MainWindow::showMessage(this, "Please sellect an image first");
        return;
    }
    ColorFilter::Layer layer = ColorFilter::toLayer(ui->cbColor->currentText());
    auto cf = new ColorFilter(this->m_fName, layer);
    std::vector<QImage> images = cf->getImages();

    ui->wHidden->setVisible(true);
    QPixmap pMap(QPixmap::fromImage(images[0]));

    if(!ui->imgView->scene()){
        qDebug() << "No Scene!";

        QGraphicsScene *scene = new QGraphicsScene(this);
        ui->imgView->setScene(scene);
    }
    ui->imgView->scene()->addPixmap(pMap);
}

void MainWindow::closeEvent(QCloseEvent *event)
{
    for(auto w : this->openedWindows)
        w->close();
    event->accept();
}

void MainWindow::showMessage(QWidget *parent, QString message)
{
    QMessageBox *noData = new QMessageBox(parent);
    noData->setText(message);
    noData->show();
}

滤色片：

#include "colorfilter.h"

#include <iostream>
#include <vector>
#include <QString>
#include <QDebug>
#include <QWidget>
#include <QLabel>

#include "opencv2/core.hpp"
#include "opencv2/imgcodecs.hpp"

ColorFilter::ColorFilter(QString &fName, ColorFilter::Layer layer):
    m_fName{fName}, m_layer{layer}
{}

std::vector<QImage> ColorFilter::getImages()
{
    cv::Mat image = cv::imread(this->m_fName.toStdString(), cv::IMREAD_COLOR);
    if(image.empty())
        qDebug() << "No image";
    std::vector<cv::Mat> newImages;
    if(this->m_layer == ColorFilter::Layer::SUPER)
        newImages = this->superImage(image);
    // else if(this->m_layer == ColorFilter::Layer::RED)
    //     newImages = this->superImage()

    std::vector<QImage> result;
    for(auto &im : newImages)
        result.push_back(this->cvMatToQImage(im));

    return result;
}

ColorFilter::Layer ColorFilter::toLayer(const QString &layer)
{
    std::unordered_map<QString, Layer> toLayer = {
        {"red", ColorFilter::Layer::RED},
        {"blue", ColorFilter::Layer::BLUE},
        {"green", ColorFilter::Layer::GREEN},
        {"superimposed", ColorFilter::Layer::SUPER}
    };
    auto it = toLayer.find(layer);
    if(it != toLayer.end())
        return it->second;
    return ColorFilter::Layer::UNDEFINED;
}

std::vector<cv::Mat> ColorFilter::superImage(const cv::Mat &image)
{
    std::vector<cv::Mat> alteredImages;
    cv::Mat tmp;

    for(int i = 0; i < 8; i++){
        tmp = image.clone();
        for(int n = 0; n < tmp.rows; n++)
        {
            cv::Vec3b *row = tmp.ptr<cv::Vec3b>(n);
            for(int m = 0; m < tmp.cols; m++){
                cv::Vec3b &pixel = row[m];
                // pixel[i] is uchar to represent values between 0 and 255
                tmp.ptr<cv::Vec3b>(n)[m][0] = (uchar)(((((int)pixel[0]) >> i) & 1)*255);
                tmp.ptr<cv::Vec3b>(n)[m][1] = (uchar)(((((int)pixel[1]) >> i) & 1)*255);
                tmp.ptr<cv::Vec3b>(n)[m][2] = (uchar)(((((int)pixel[2]) >> i) & 1)*255);
            }
        }
        alteredImages.push_back(tmp);
    }
    return alteredImages;
}

QImage ColorFilter::cvMatToQImage(const cv::Mat &image)
{
    if (image.type() == CV_8UC1) {
        // Grayscale image
        return QImage(image.data, image.cols, image.rows, image.step, QImage::Format_Grayscale8);
    } else if (image.type() == CV_8UC3) {
        // 3-channel color image (BGR format)
        // cv stores images in BGR format, but QImage expects RGB, that's why it it swapped
        return QImage(image.data, image.cols, image.rows, image.step, QImage::Format_RGB888).rgbSwapped();
    } else {
        qDebug() << "Unsupported cv::Mat format for QImage conversion";
        return QImage();
    }

}

Answer 1

问题出在conan安装opencv库上，手动安装ali后错误就消失了。